Active Pen Transparent Elastic Point Force Sensing
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Solution Overview
Problem
Existing active pens for touch display screens fail to accurately sense operating force, leading to deviations between user inputs and display outputs, resulting in low accuracy of human-machine interaction, especially in writing applications.
Innovation Solution
An active pen with a transparent elastic pen point, optical receiver, and excitation signal emitting apparatus, where the contact area with the touch display screen changes with operating force, and the optical receiver adjusts the excitation signal intensity based on detection light intensity, enhancing interaction accuracy by correlating force with display output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an existing active pen is used to contact the touch display screen, then the nib can be designed to be relatively small, but the pen cannot sense the operating force of a user, resulting in low accuracy of human-machine interaction
Solution Approach 1:
The patent introduces detection light as an intermediary to measure operating force. The detection light passes through the transparent elastic pen point, and its intensity changes in response to the contact area changes caused by operating force, enabling force sensing without complex mechanical sensors in the pen.
Solution Approach 2:
The patent replaces mechanical force sensing mechanisms with an optical detection system. Instead of using mechanical springs or pressure sensors inside the pen, the system uses optical intensity changes of detection light passing through the transparent elastic pen point to determine operating force.
2Measurement precision
If the contact area of the pen point is increased to sense operating force, then force detection accuracy improves, but the nib size increases, deviating from the advantage of small nib design
Solution Approach 1:
The patent uses a transparent elastic pen point with specific material properties that allow it to be transparent to detection light while being elastic enough to deform with operating force. This local quality of transparency combined with elasticity enables force detection through optical means without requiring a large contact area.
Solution Approach 2:
The patent changes the physical state of the pen point material to be transparent and elastic, allowing it to undergo parameter changes (deformation) in response to operating force that can be detected optically. The transparency parameter enables light transmission, while the elasticity parameter enables deformation proportional to applied force.
3Manufacturing precision
If the active pen uses a small nib design, then the pen tip can be precise, but the pen cannot accurately represent handwritings with varying weights, causing poor writing effect
Solution Approach 1:
The patent implements feedback by using the optical receiver to detect the intensity of detection light passing through the transparent elastic pen point, which correlates with operating force. This feedback information is used to determine the excitation signal intensity, enabling the system to represent handwriting weight accurately.
Solution Approach 2:
The transparent elastic pen point serves multiple functions: it maintains the small nib size for precision, provides mechanical contact with the screen, and simultaneously acts as an optical medium for force detection. This multi-functionality enables both precise positioning and accurate force sensing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly improves human-machine interaction accuracy by accurately translating operating force into corresponding display outputs, resulting in more true representations of handwritings and improved finger-writing recognition.
Implementation Method 1
the contact area between the transparent elastic pen point and the touch display screen is increased with an increase in an operating force
Implementation Method 2
the optical receiver is configured to receive detection light which comes from the touch display screen and penetrates through the transparent elastic pen point
Implementation Method 3
the excitation signal emitting apparatus is in signal connection with the optical receiver, so as to emit an excitation signal of a corresponding intensity to the touch display screen in accordance with the intensity of the detection light received by the optical receiver
Data Source
AI summary
The present disclosure discloses an active pen for a touch display screen, a touch display screen and a touch control input system, to improve human-machine interaction accuracy of operating the touch display screen with the active pen by a user. The active pen for the touch display screen comprises a transparent elastic pen point, an optical receiver and an excitation signal emitting apparatus, wherein the contact area between the transparent elastic pen point and the touch display screen is increased with an increase in an operating force, the optical receiver is configured to receive detection light which comes from the touch display screen and penetrates through the transparent elastic pen point, meanwhile, the excitation signal emitting apparatus is in signal connection with the optical receiver, so as to emit an excitation signal of a corresponding intensity to the touch display screen in accordance with the intensity of the detection light received by the optical receiver.